\begin{frame} \frametitle{Aggregations} \begin{goal}{} \emph{Aggregation functions} are functions from a set or multiset to a single value, e.g., \begin{talign} \min\,\{\, 42, 57, 5,13, 27 \,\} = 5 \end{talign} They take as input the values of an entire column. \end{goal} \pause\medskip Aggregation functions are also known as \begin{itemize} \item \emph{group functions}, or \item \emph{column functions} \end{itemize} \medskip \begin{goal}{} Typical use: statistics, data analysis, report generation. \end{goal} \end{frame}